ps1 outputs rca composite video or rf modulated 'tv' signal.You can either get a monitor that takes either of those as a 'tv' input, ORGet a converter box that adapts your output signal to something the monitor can use (likely VGA). The converter box is often an expensive option.
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google?"composite to vga adapter"or converter..I'd be happy to search it for you, but that's all I would have done.